Kathryn Smith (pictured) was left with a two centimetre stab wound on her cheek after being jumped by as many as 10 lags on a prison stairwell

The drug addict mother who stamped her 21-month-old daughter to death had her face slashed in a 'revenge attack' in jail.

Kathryn Smith was left with a two centimetre stab wound on her cheek after being jumped by as many as 10 lags on a prison stairwell.

The 23-year-old screamed in agony as she was maimed in a brutal four minute assault that saw her punched, kicked and knifed.

Sources inside the notorious Foston Hall women's prison in Derbyshire say the attack was planned by violent inmates desperate to seek revenge on the evil young mother for the utterly savage murder of her helpless toddler.

Ayeeshia Jane Smith, who weighed just 20lbs when she died, was killed while she cried 'stop mummy, stop daddy'.

Her mother stamped on her chest with such force that she suffered a fatal heart injury, three broken ribs and bit through her own tongue.

Experts said her injuries were so severe she resembled a high-speed car crash victim.

Smith was last month jailed for a minimum of 24 years. Her ex-partner, Matthew Rigby, 22, was convicted of causing or allowing the child's death, but cleared of murder.

The jail attack was led by two women, thought to have used a homemade blade.

A source told The Mirror: 'There had been a lot of talk about attacking Smith, but most people wouldn't go through with it as they don't want time added on to their sentences.

Sources inside the notorious Foston Hall women's prison (pictured) in Derbyshire say the attack was planned by violent inmates desperate to seek revenge on the evil young mother for the utterly savage murder of her helpless toddler

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Inmates at Foston Hall have included some of Britain's most evil women. Moors Murderer Myra Hyndley was a prisoner for almost four decades before dying at 60.

In sentencing Smith in April, Judge Andrews said: 'You were completely self-centred. You wanted to take care of Ayeeshia yourself but not at the expense of running your love life the way you wanted.

Ayeeshia Jane Smith (pictured), who weighed just 20lbs when she died, was killed as she cried 'stop mummy, stop daddy'. Her mother stamped on her chest with such force that she suffered a fatal heart injury, three broken ribs and bit through her own tongue

'You are a devious, manipulative and selfish young woman who would stop at nothing to get your own way.

'To that end you were prepared to tell lie after lie, telling professionals what you thought they wanted hear.

'If matters were not working out the way you wanted them to, you would display an explosive temper.'